MULTIPLE_BODY_PARAMETERS error for application/x-www-form-urlencoded

[kevinoid]

If an OpenAPI 2.0 document contains an operation which contains multiple parameters in formData and consumes application/x-www-form-urlencoded, validation fails with MULTIPLE_BODY_PARAMETERS. If consumes is changed to multipart/form-data, validation succeeds without error. For example:

{
  "swagger": "2.0",
  "info": {
    "title": "Title",
    "version": "1.0"
  },
  "paths": {
    "/": {
      "post": {
        "operationId": "test",
        "consumes": [
          "application/x-www-form-urlencoded"
        ],
        "produces": [
          "application/json"
        ],
        "parameters": [
          {
            "name": "first_name",
            "in": "formData",
            "type": "string"
          },
          {
            "name": "last_name",
            "in": "formData",
            "type": "string"
          }
        ],
        "responses": {
          "204": {
            "description": "Example response"
          }
        }
      }
    }
  }
}

The OpenAPI document validates and Autorest generates correct code, but oav validation fails.

This issue is similar to #805.

I believe it could be fixed by checking for application/x-www-form-urlencoded in addition to multipart/form-data at

oav/lib/swaggerValidator/semanticValidator.ts

Line 527 in bf50f77

consumes.includes("multipart/form-data")

Thanks for considering,
Kevin